Added first version of 'Plugins' window. It's accessible through 'Edit/Plugins' item in roster menu. It seems that you can successfully (de)activate plug-ins through GUI now.

Added 'homepage' attribute to Plugin class.

Added (commented out) calls of pycallgraph in src/gajim.py for later use.

[xbright] Changed 'python' to 'python2.5' because code uses modules not available in previous versions of Python.

Added plug-in deactivation mechanism, which allows plug-ins to clean up after themselves (eg. disconnecting handlers made in GUI); GUI extension points handlers are removed from list.

Updated Length Notifier plug-in so that it can be properly deactivated.

Added mechanism to successfully load plugins after GUI extension points have been created, e.g. when we want to modify ChatControl behaviour and objects of this class have already been created.

Also: customized IPython console look

Added docstrings in reST format (also with todos). Commented out 'print' statements related to roster window. A few modifications to make code prettier (PyLint driven).

- basic PluginManager class that loads plugins from *.py files
  in given directories
- Singleton metaclass was created to use with PluginManager;
  notice: __init__ of class is called only once (not like in code
	that is included in Python Cookbook)
- variable to keep paths of plugin directories has been created
  (common.gajim.PLUGINS_DIRS); also added initilization of these
  paths to common.ConfigPaths
- added global variable with PluginManager object:
  common.gajim.plugin_manager
- created customized logger for plugin system ('gajim.plugin_system')
- created function decorator plugins.helpers.log_calls which logs
  each call of function/method; it also logs when function is left
- base class Plugin for plug-in implementation added; not much
  here - only empty class attributes: name, short_name, authors,
	version, description
- based on Plugin class, first plugin was created named
  LengthNotifierPlugin; it is used to notify users when they
  exceed given length of message during writing it (text entry
  field highlights)
- first GUI extension points works when ChatControl object
  is created (it is used in mentioned plugin)
- added 'epydoc.conf' file customized a little bit (file
	is also in trunk now)
- fixed indentation in common.sleepy module (also in trunk
	now)

fix tooltip about logging encrypting messages. (it is now shorter, better understood (jargon removed where possible), and we it's OpenPGP and not just GPG guys {or last time I checked :$})

@bct: When moving the OTR stuff, you would've needed to adjust the
XHTML killing part. This patch fixes it. I didn't even notice since
I have XHTML disabled globally.

fixes #3963

fixes #3961

fixes #3950

fixed lock icon when session has been terminated

(Tooltips might not be complete because of some not yet addressed backend bugs)

This fixes a bug with metacontacts over different groups and should stop contact duplication in most cases.

thread id, but to even remove the lock symbol when OTR was ended
and we don't have a thread id.

Whenever we write to the underlying child_model gtk will call the _visible_func on itself.

when that event is received and the lock icon updated.

 * use correct API in session.py
 * only filter when really needed

  tag to outgoing messages anymore. Messages are not even passed to
  libotr anymore then.
* If we don't support OTR, strip OTR tags from the message before
  displaying it.

* Don't set encrypted = True if it was only a tagged plaintext msg.